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https://github.com/kaminari/kaminari.git
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65 lines
2 KiB
Ruby
65 lines
2 KiB
Ruby
# models
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class User < ActiveRecord::Base
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has_many :authorships
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has_many :readerships
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has_many :books_authored, :through => :authorships, :source => :book
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has_many :books_read, :through => :readerships, :source => :book
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has_many :addresses, :class_name => 'User::Address'
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def readers
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User.joins(:books_read => :authors).where(:authors_books => {:id => self})
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end
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scope :by_name, lambda { order(:name) }
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scope :by_read_count, lambda {
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cols = if connection.adapter_name == "PostgreSQL"
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column_names.map { |column| %{"users"."#{column}"} }.join(", ")
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else
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'"users"."id"'
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end
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group(cols).select("count(readerships.id) AS read_count, #{cols}").order('read_count DESC')
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}
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end
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class Authorship < ActiveRecord::Base
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belongs_to :user
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belongs_to :book
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end
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class Readership < ActiveRecord::Base
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belongs_to :user
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belongs_to :book
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end
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class Book < ActiveRecord::Base
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has_many :authorships
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has_many :readerships
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has_many :authors, :through => :authorships, :source => :user
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has_many :readers, :through => :readerships, :source => :user
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end
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# a model that is a descendant of AR::Base but doesn't directly inherit AR::Base
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class Admin < User
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end
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# a model with namespace
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class User::Address < ActiveRecord::Base
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belongs_to :user
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end
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# a class that uses abstract class
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class Product < ActiveRecord::Base
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self.abstract_class = true
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end
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class Device < Product
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end
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#migrations
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class CreateAllTables < ActiveRecord::Migration
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def self.up
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create_table(:gem_defined_models) { |t| t.string :name; t.integer :age }
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create_table(:users) {|t| t.string :name; t.integer :age}
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create_table(:books) {|t| t.string :title}
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create_table(:readerships) {|t| t.integer :user_id; t.integer :book_id }
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create_table(:authorships) {|t| t.integer :user_id; t.integer :book_id }
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create_table(:user_addresses) {|t| t.string :street; t.integer :user_id }
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create_table(:devices) {|t| t.string :name; t.integer :age}
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end
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end
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ActiveRecord::Migration.verbose = false
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CreateAllTables.up
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